Audio-Technica ATH-CKS50TW Wireless Earphones

Safety Precautions

[Warning] (▲ 警告): Indicates a potential for death or serious injury if handling is incorrect.

[Caution] (▲ 注意): Indicates a potential for property damage if handling is incorrect.

[Important Warning] (▲ 危険): Indicates a potential for imminent danger, leading to death or serious injury.

About the Earphones

• Do not get wet.
• Do not use near medical devices (e.g., heart pacemakers) as radio waves may affect their operation. Do not use indoors at medical facilities.
• Do not insert foreign objects (flammable materials, metal, liquids) into the product. This can cause electric shock, malfunction, or fire.
• Follow airline instructions when using on aircraft. Radio waves may cause malfunctions leading to accidents.
• Do not use near automatic control equipment such as automatic doors or fire alarms. Radio waves may cause malfunctions leading to accidents.
• Do not disassemble or modify the product. This can cause electric shock, malfunction, or fire.
• Do not apply strong impact to the product. This can cause electric shock, malfunction, or fire.
• Do not touch with wet hands. This can cause electric shock or injury.
• Do not cover the product with cloth or other materials. This can cause overheating, leading to fire or injury.
• Never use while operating a vehicle (car, motorcycle, bicycle). This can lead to traffic accidents.
• Do not use in locations where ambient sound cannot be heard, as it may cause accidents (e.g., railroad crossings, station platforms, construction sites, roads with traffic).
• Do not use at a volume that prevents you from hearing ambient sounds. The high degree of sealing in this product makes ambient sounds difficult to hear. Use at a volume that allows you to hear surrounding sounds and ensure your safety.
• If you notice any abnormality (sound, smoke, smell, heat, damage), stop using the product immediately and contact the store of purchase or our service center for repair.
• Do not place within the reach of infants. This may cause accidents such as accidental ingestion.
• Do not stimulate your ears with loud volume. Use at a moderate volume that does not excessively stimulate your ears. Listening at high volumes for extended periods can adversely affect your hearing.
• If you experience any skin abnormalities, discontinue use immediately. If symptoms do not improve, consult a doctor.
• If you feel unwell during use, remove the product from your ear and stop using it.
• After use, check if the earpieces are attached to the earphones. If an earpiece remains in your ear and cannot be removed, seek immediate medical attention.
• If you experience itching or irritation due to moisture, discontinue use. This can lead to injury or accidents.

About the Charging Case

• Do not disassemble or modify the charging case. This can cause electric shock, malfunction, or fire.
• Do not apply strong impact to the charging case. This can cause electric shock, malfunction, or fire.
• Do not touch the charging case with wet hands. This can cause electric shock or injury.
• If you notice any abnormality (sound, smoke, smell, heat, damage), stop using the product immediately and contact the store of purchase or our service center for repair.
• Do not get water on the charging case. This can cause electric shock, malfunction, or fire.
• Do not insert foreign objects (flammable materials, metal, liquids) into the charging case. This can cause electric shock, malfunction, or fire.
• Do not cover the charging case with cloth or other materials. This can cause overheating, leading to fire or injury.
• Do not charge if there is moisture or foreign matter on the product's battery jack or the included USB charging cable. This can cause corrosion, overheating, smoke, fire, or electric shock.
• Do not charge if the connector of the included USB charging cable is bent or the connection is loose. This can cause overheating, smoke, fire, or electric shock.
• Do not charge using anything other than the included USB charging cable. This can cause malfunction or fire.
• When charging using an AC adapter, do not charge with devices that have a quick charging function (outputting a voltage higher than 5V). This can cause malfunction.
• Do not place in direct sunlight, near heaters, or in high humidity/dusty locations. This can cause malfunction or defects.
• Do not use solvents such as benzine, thinner, or contact restorer. This can cause deformation or malfunction.

About the Rechargeable Battery

The earphones and charging case contain built-in rechargeable batteries (Lithium-ion batteries).

• [Danger] Do not puncture with nails, hit with a hammer, or step on. This can cause overheating, damage, or fire.
• [Danger] Do not drop or apply strong impact. This can cause liquid leakage, overheating, or rupture.
• [Danger] Do not get wet. This can cause overheating, rupture, or fire.
• [Danger] Do not put in fire, heat, disassemble, or modify. This can cause liquid leakage, overheating, or rupture.
• [Danger] If battery liquid gets into your eyes, do not rub. Rinse immediately and thoroughly with clean water (like tap water) and seek medical attention.
• [Danger] If battery liquid leaks, do not touch the liquid with bare hands. If liquid remains inside the product, it may cause malfunction. If liquid leakage occurs, please consult our service center. If you accidentally ingest the liquid, rinse your mouth immediately with clean water (like tap water) and seek medical attention. If the liquid gets on your skin or clothing, wash it off immediately with water. If you experience any skin discomfort, seek medical attention.
• [Danger] Do not use, leave, or store in the following locations:
  • Locations exposed to direct sunlight, high humidity, or hot cars.
  • Near heat sources such as stoves.
  This can cause liquid leakage, overheating, rupture, or performance degradation.

If the usage time becomes short even after fully charging the product, the built-in rechargeable battery may have reached the end of its lifespan. Please contact our service center.

Service Center: 0120-887-416 (For mobile phones and PHS, call 03-6746-0212)

Recycling Request

Built-in rechargeable batteries can be recycled. If you wish to recycle this product, please send it postage-paid to the following address. Please note that we cannot return the product after the battery has been removed.

Address: 〒915-0003 Fukui Prefecture, Echizen City, Tōya-chō 87-1, Audio-Technica Fukui Inc., Secondary Battery Collection Department. TEL: 0778-25-6736 (Battery Collection Only)

Compatibility Information

For a list of compatible Bluetooth mobile phones, please visit our website or contact our customer service desk.

Website: https://www.audio-technica.co.jp/support/

You can access this via the QR code on the right. [QR Code]

This product can only be used in countries where it complies with or has obtained certification under the radio laws of that country. It cannot be used in countries other than the country of sale.

After-Sales Service

If the product malfunctions during normal household use, following the instructions, connection, and precautions in this guide, it will be repaired free of charge within the period and according to the terms stated in the warranty card. If the product cannot be repaired, it will be replaced. Please keep your sales receipt or proof of purchase along with the warranty card as confirmation of the warranty start date, and present them when requesting repairs.

Contact Information (Phone Reception / Weekdays 9:00 - 17:30)

For inquiries about product specifications, usage, repairs, or parts, please contact your retailer, our service desk, or our support page on the website.

• Customer Consultation Desk (Product Specifications/Usage): 0120-773-417 (For mobile phones and PHS, call 03-6746-0211) FAX: 042-739-9120 E-mail: support@audio-technica.co.jp
• Service Center (Repairs/Parts): 0120-887-416 (For mobile phones and PHS, call 03-6746-0212) FAX: 042-739-9120 E-mail: servicecenter@audio-technica.co.jp
• Website (Support): https://www.audio-technica.co.jp/support/

Model Numbers: ATH-CKS50TW-L (R001-A17935), ATH-CKS50TW-R (R001-A17934)

Audio-Technica Corporation

〒194-8666 Tokyo, Machida City, Nishi-naruse 2-46-1 www.audio-technica.co.jp

©2021 Audio-Technica Corporation

Document Version: 132513590-01-01 ver.1 2021.08.01

Usage Notes

• When using the product, be sure to read the instruction manual of the connected device as well.
• We are not responsible for any loss of data from connected devices.
• Be mindful of the volume in public transportation or public places to avoid disturbing others.
• Always set the volume of the connected device to the minimum before connecting.
• In dry environments, you may experience a tingling sensation in your ears. This is due to static electricity accumulated on your body or the connected device and is not a malfunction of the product.
• Do not apply strong impact to the product.

About Active Noise Cancelling Function

This product uses built-in microphones to pick up ambient environmental noise (such as vehicle noise or air conditioner sounds) and cancels it out by outputting an inverse phase sound. As a result, environmental noise is reduced.

• The noise-cancelling function of this product is primarily effective against low-frequency noise, but it does not eliminate all noise.
• In quiet environments or depending on the type of noise, the noise-cancelling effect may not be noticeable.
• If the fit of the product is incorrect, the noise-cancelling effect may be reduced, or a whistling sound (howling) may occur. In such cases, refit the product.
• Also, do not allow water to splash onto the product.
• When used for extended periods, the product may discolor due to ultraviolet rays (especially direct sunlight) or friction.
• If the charging case is placed in a bag or pocket with the USB charging cable connected, the cable may get caught, leading to disconnection or malfunction.
• When using the USB charging cable, always pull by the plug to insert or remove it. Pulling the cable can cause disconnection or accidents.
• When the USB charging cable is not in use, always remove it from the charging case.
• When the product is not in use, store it in the included charging case.
• If you use earpieces other than the included ones, the earphones may not fit into the charging case, or they may not charge correctly. Always use the included earpieces.
• When using this product, select the earpiece that best fits your ear from the included earpieces and wear it securely.
• The call function of this product is only valid for calls made via mobile phone lines. Calls made via packet communication (e.g., through apps) are not guaranteed to work.
• If electronic devices or transmitters (like mobile phones) are near the product, noise may enter the product. In such cases, use the product at a distance from them.
• Using the product near TV or radio antennas may cause noise in the TV or radio. In such cases, use the product at a distance from them.
• To protect the built-in rechargeable battery, charge it at least once every six months. If left unused for too long, the battery life may shorten or it may become unable to charge.
• When charging the product, avoid direct sunlight and charge in a well-ventilated area (10-35°C). This can lead to battery degradation, reduced continuous usage time, or inability to charge.
• If the earphones are wet, completely wipe off the moisture with a dry cloth before placing them in the charging case. The charging case is not waterproof/drip-proof. Do not charge the earphones while they are wet.
• The hear-through function of this product allows you to hear ambient sounds while wearing the earphones, using the built-in microphones. Depending on the volume of the music or other audio being played, ambient sounds may be difficult to hear. In such cases, lower the volume of the music or other audio.
• Even when using the hear-through function, ambient sounds may be difficult to hear depending on the situation. Do not use this product in dangerous locations where ambient sounds are essential for safety, such as areas with heavy traffic.
• To maximize the noise-cancelling effect, select the earpieces from the included set that provide the best sound isolation for each ear and wear them securely.
• When using this product in vehicles such as trains, buses, or trucks, noise may occur depending on the rail or road conditions.

If Connection Issues Occur

If pairing cannot be released or connection fails, you can force pairing mode to re-pair. While performing the operation, hold the earphones down so they do not come out of the charging case.

1. After placing both L/R earphones in the charging case (with battery remaining), press and hold the multi-function buttons on both earphones for approximately 6 seconds after about 5 seconds.
2. After the indicators on both earphones light up red, remove the earphones from the charging case.
3. The product will switch to "Searching for device" mode (pairing mode), allowing you to pair with the desired Bluetooth device.
4. If the procedure does not work as expected, remove the earphones again and repeat the same operation.

If Product Operation is Abnormal

Reset the product. While performing the operation, hold the earphones down so they do not come out of the charging case.

1. After placing both L/R earphones in the charging case (with battery remaining), double-press the multi-function buttons on both earphones after about 5 seconds.
2. Confirm that the indicators on both earphones start blinking white, then while still in the charging case, press and hold the multi-function buttons on both earphones for approximately 6 seconds or more.
3. Release your fingers after confirming that the indicators on both earphones light up red and then turn white. Reset is complete.
4. Delete the product registration from the Bluetooth device side.
5. Remove the earphones from the charging case again and perform pairing.
6. If the procedure does not work as expected, remove the earphones again and repeat the same operation.

About Drip-Proof Performance

The drip-proof performance of this product applies only to the earphone units.

• The earphone units have drip-proof treatment equivalent to IPX4, but the sound output part is not drip-proof.
• The drip-proof specification is designed to protect against rain (IPX4 equivalent). JIS Protection Grade IPX4 means that the main unit functions are protected against splashing water from any direction.
• Cannot be used underwater.
• Cannot be used in high-humidity locations such as bathrooms.
• Since it is not waterproof, getting water on it or immersing it in water can cause malfunction.
• If the earphones are wet, they may not perform optimally. Attach a dry cloth to the earphones, shake them multiple times to remove moisture, and then dry them thoroughly before use. For details, please refer to the instruction manual on our website.

About Bluetooth® Products

In the frequency band used by this equipment, industrial, scientific, and medical devices such as microwave ovens, as well as second-generation low-power data communication systems, private wireless stations for mobile identification (requiring a license), specified low-power radio stations (not requiring a license), and amateur radio stations (requiring a license) are in operation.

1. Before using this equipment, confirm that second-generation low-power data communication systems, private wireless stations for mobile identification, specified low-power radio stations, and amateur radio stations are not operating nearby.
2. In the event that harmful radio interference occurs from this equipment to another private wireless station for mobile identification, turn off this product immediately. Then, contact our customer consultation desk to inquire about measures to avoid interference.
3. For any other cases of harmful radio interference from this equipment to second-generation low-power data communication systems, specified low-power radio stations, or amateur radio stations, or if you have any questions, please contact our customer consultation desk.

2.4FH1

This radio equipment uses the 2.4GHz band. It employs the FH-SS modulation method, with an interference distance of 10m.

This product complies with the technical standards of Japan's Radio Law. Modifying this product without permission from the Ministry of Internal Affairs and Communications is prohibited. Violation of this law is punishable by law.

Co-use with Other Devices

Interference, such as audio interruptions, may occur due to the influence of devices using the same frequency band (2.4GHz) as this product, such as Bluetooth devices, wireless LAN devices, and microwave ovens. Similarly, this product may affect these devices. Therefore, please note the following:

• Install devices that use the same frequency band (2.4GHz) as this product separately.
• Do not use in hospitals.

Usage Notes

The connected device must comply with and be certified under the Bluetooth standard specifications defined by Bluetooth SIG. Even if the device complies with the Bluetooth standard specifications, connection may not be possible, or operating methods and functions may differ depending on its characteristics and specifications.

About Communication Range

Communication may be interrupted even within the communication range due to obstacles and radio interference from other electronic devices. In such cases, use the earphones close to the Bluetooth-enabled device.

For More Enjoyable Bluetooth Communication

The effective communication range of this product varies depending on obstacles and radio conditions. To enjoy the product comfortably, please use the product as close as possible to the Bluetooth device. By ensuring there are no human bodies or other obstacles between the product's antenna section and the Bluetooth device, you can minimize noise and audio interruptions.

[Antenna Section]